Hosted system are an already built advance telephone system, so instead of buying the actual control unit which is the brain of the system you are only investing in the handsets which will save you a considerable amount of money, even more is that as the system is maintained and managed by us you do not need to worry about the maintenance costs as we have you covered. http://www.telephone-system-engineers.co.uk/considering-switching-to-a-hosted-voip-cloud-pbx-phone-system/